Separable core



J. BRUNDAGE.

SEPARABLE CORE.

APPLICATION FILED JUNE 29, 1920.

Patented Oct. 26, 1920 2 SHEETS-SHEET I.

J. W. BRUNDAGE.

SEPARABLE CORE.

APPLICATION FILED JUNE 29. 192 0. 1 156,596,, I Pafiented Oct. 26, 1920 2 SHEETISSHEET 2.

UNITED s'mss rarer JAMES w. Bannmien, or AKRON, OHIO, ASSIGNOR TO THE MILLER RUBBER VCOIVL" PANY, or AKRON/OHIO, A conPoRArIoNoF 0am."

SEPARABLE conn.

Specification of Letters Patent.

*Patentedf'oct. 2c, 1920.

, Application filed June 29, 1920. Serial No, 392,654.

T 0 all whom 2'6 may concern Be it known that 1, JAMES W. BRUNDAGE,

a citizen of the United States, and resident of Akron, Ohio, have invented certain-new and useful Improvements in Separable Cores, of which the followingis a specification.

My present invention relates to improve,

ments in what are known as collapsible-or separable cores or mandrels, such as are used for manufacturing the outer shoes or casings .of' pneumatic tires of the double tube type.

" The invention aims to provide an eX-.

tremely simple, economical and efficient type of core which may be easily manipulated to enable the segments to be separately withdrawn from the completed tire casing, and in which there will be complete absence of Darts such as nuts or bolts which are reinoved in the separation ofthe core, and hence liable to be lost or misplaced.

The invention further aims toprovijde a construction, which, while capable of manipulation as aforesaid, will, in the assemd condition of the segments, hold. the same firmly in accurate alinement under the stresses dueto the mding of the tire fabric on the core and its manipulation in the vulcanizers, thereby insuring perfection in the finished tire.

/Vith these and other objects in view, the invention includes the novel features of construction and arrangement and combination of parts hereinafter described and part cularly defined in the appended claims. 7

An embodiment of my inventionis illustrated in the accompanying drawings, in which Figure 1 is a side elevation of a core or Fig. 6 is a fragmentary perspective View.

Referring by reference characters to these drawings, the numeral 1 indicates a core or mandrel which is of annular or ring-shaped form and is composed of a plurality of arcshaped sections or segments. In the form illustrated in the drawing, 1 have shown the mandrel as composed offour segments as aconvenient number, one of these members are l 1 which constitutes-the key piece being of 7 tapered ,or wedge-shaped formation which enables it to be drawn inwardly and rewhich may be thereafter removed from the tire piece by piece, as wellunderstood by those skilled in the art.) The lines of division between the side sections 1* and the remaining opposite section 1 may be on radial lines, as shown. i. v

The core has .a shape when viewed in cross-section, as shown'in Fig. 2,.which cor responds to the interior of the finished tire, and it is provided with an inwardly extend.- ing flange or. web This webisprovided upon its opposite faceswith annular grooves or. channels 3, the walls of which are tapered or inclined as shown. For holding the core sections in alinementand abutting engagement, I provide a pair of rings dlwhich are duplicates of each other and which are provided with annular wedge-shaped ribs adapted to engage the wedge-shaped or tapered grooves 3 as clearly shown in Fig. 2.

corresponding face of the lug of the opposite ring.

60 moved to unlock the remaining sections The rings are preferably exact duplicates of each other and hence interchangeable, and it will be seen that, when they are in position on opposite sides of the assembled core sections or segments, the lugs lie within the inner surfaces of .theweb .2 of the.

"core When thus positioned,. acircumferential movement of one ring relative to the other will cause the inclined faces a to ride upon each other, thus drawing the rings toward each other and clamping. the web 2 firmly thei'ebetween. This clamping action 1 forces the tapered ribs of the rings into the, tapered grooves of the web, thus accurately alining the sections and holding them firmly in proper abutting position.

Any'suitable means may be provided for manipulating the rings but a device which rings having lugs or consisting of a lever 5 having a dog or portion 5 designedto abut against the heelof one lug, and a hook member 6 pivoted thereto and having a hook portion or dog 6? de signed to abut against the heel of the other adjacent or cooperating lug.

With said tool dogs in abutting position against the heels of a pair of adjoining lugs the swinging of the lever in the proper direction will force the lugs toward each other, effecting the circumferential shifting of the rings in opposite directions, thus securing the clamping action above described. 5 is shaped,

The opposite end of the lever as indicated at 5 for entry between the adjacentlugs to enable them to be'readily pried apart when the core is to be broken down or disassembled. v

' As an additional safeguard against loosening of the parts during the manipulation of the core and the winding of the fabric thereon, I may provide locking means such as set screws 7, 7 threaded through openings in two of the cooperating lugs P in such position as to engage the inner edge of the corresponding core section and thus lock the rings against circumferential movement; The inner ends of the screws are preferably tapered, as shown. 7

Having thus described myinvention, what I claim is 1. A device of the character described comprising a plurality of arcshaped sectionsadapted to abut against each other to form a separable core or mandrel, and a pair of locking rings adapted to overlie the inner portions of saidsections, one of said projections with inclined faces adapted to coact with lugs on the opposed ring for securing said rings together by a circumferential movement of one ringrelative to the other,

2. A' device 7 of the character described plurality of arc-shaped sec-V comprising a tions adapted to abut against each, other to form a separable core or mandrel, and a pair of'lockin'g rings adapted tooverlie the inner iportions of said sections, said rings having'a plurality of inclined portionsadapted to overlie the corresponding inclined portions of the lugs on the other ring. v V Y A A device ofthe character described comprising a lugs provided with the inner portions of said sections, each of said rings having a plurality of circumferentially disposed lugs adapted to abut against theinner face of the core sections, the lugs of one ring having portions with faces inclined to the plane of the core and adapted to coact with corresponding portions on the lugs of the other ring. 1 I

4. A device of the character described comprising 'a plurality ofarc-shaped sec; tions adapted to abut against each other to form a separable core or mandrel, and a pair of locking rings adapted to overlie the inner portions of said sections, oneof said rings having lugs or projections with inclined faces adapted to coact with lugs on the opposed ring for securing said rings together by a circumferential movement of one ring relative to the other, and meansfor locking said rings against circumferential movement. i

5. A device of the character described comprising a plurality of arc-shaped sections adapted to abut against each other 'to form a-separable core or mandrel, and a pairof locking rings adapted to overlie the inner portions of said sections, said rings having a plurality of lugs provided with inclined portions adapted to overlie the corresponding inclined portions of the lugs on the other ring, and locklng means carried by a pair of said lugs and adapted to engage the corresponding core section.

6. A device of the character described tions adapted to abut against each other to form a separable core or mandrel, and a pair of locking rings adapted to overlie the inner portions of said sections,said rings having "a plurality of lugs provided with inclined portions adapted to overlie thecorresponding inclined portions of the lugs on the other ring, and radially arranged lock ing set screws threaded through openings in a pair of the lugs and adapted to engage the corresponding core section.

ln testimony whereof, I afiix my signature. Y

JAMES BRUNDAGE.

plurality of arc-shaped sec; 7 

